I don't see how age is able to restrict helping. There is so much place to volunteer like for old, disabled or dying people, or being in some kind of rescue groups. It depends on the place also isn't.
I am kind of person walking around town and looking for things like that so I'm really confident about writing that wherever you live there must be a places where you can do something. Even in a village or smaller towns.
The thing is about a stress of doing that. Try it! There is no must about it. Good luck!
Sorry to hear about your friend, it sucks when things like that happen